Steam-turbine gland with more than one pipe connection



June 21 1927. 1,632,981

A. M. P. LUNDEGAARD STEAM TURBINE GLAND-WITH MORE THAN ONE PIPE CONNECTION Filed Feb. 4-. 1921 Patented June 21, 1927.

UNITED STATES PATENT OFFICE.

ANDERS MARIUS rmmxsmv LUNDEGAARD, orcornmmemv, DENMARK.

STEAM-TURBINEJGLAND WITH Mom; THAN our: PIPE oommo'riou- Application filed February 4, 1921, Serial No. 442,432; and in Denmark February 4; i920.

The present invention relates to the specific connections of steam turbine stufiing boxes, and its object is to provide a more effective packing of the shaft or shafts of turbines and especially of marine turbines which are adapted to be driven in either direction of rotation.

In the construction hitherto known the stuffing boxes are provided with one or more chambers into which either water, steam or exhaust steam is admitted by means of a pipe but only one such pipe is connected to 'its respective stufling box. In the present invention an arrangement is set forth wherein two or more of the pipes are connected to one stufiing box or to other stufiing boxes whereby a more eflicient packing is obtained when the turbine is driven in either direction of rotation by providing valves in the pipes. One of the advantages obtained by the present invention resides therein that in case of variation of the load on theturbine the pressures will vary, which necessitates an adjustment of the pressure in the cham bers of the stufling boxes and this adjustment is efliciently carried out by the arrangement of the pipe system.

Other objects will be apparent from the specificationtaken inconnection with the accompanying drawing in which: I

Figure 1 is across-sectional view of a stu'fiing box taken on line I-I of Fig. 2,

Fig. 2 is an axial section of the stuffing.

box, and

Fig. 3 represents a diagrammatic arrangement of the pipe connections for two stuffing boxes represented in section having a shaft in each box. 7

The two stufling boxes A and A are mounted on a single turbine shaft or on two different shafts B and B whereby each stuffing box operates against steam having a pressure represented by p and 7). Each box is provided with three chambers g, r and sand q, r and s which are formed by the plurality of packing rings 7) and b in said boxes. The arrangement of pipes for these stuiling boxes are as follows: From the steam chamber 9 of box A a pipe at leads to the atmosphere and similarly a pipe at leads from the chamber g of box A. The outer chamber 0" of box A communicates with the inner chamber 8 of box A by a pipe 0 having a valve d therein and similarly outer chamber r of box A communicates with inner chamber 8 of box A by pipe 0 having a valve (Z therein. I

With this arrangement the object is attained that an equal amount of steam shall the smaller the steam loss, and theoretically it appears that this pressure should be zero that is atmospheric pressure in the chambers I r and T but practicallya small over pressure will be mam-tamed n order to make sure that no air will be sucked through pipes a and a" into the turbine .or its condenser. In the following it will be shown how through suitable operation of the valves d and d near atmospheric pressure can be maintained in chambers r and r.

Assuming that the pressure p is greater than the pressure p or that pressure p is greater than atmospheric pressure and p is below atmospheric pressure, then valve cl will be opened, which will allow steam to iass from chamber 8 to chamber r throiwh pipe 0 and by suitably adjusting valve (Z an equal amount of steam will escape from pipes a and a. Itis thus possible by suitably ad ustmg either one or both valves d and d, which may be opened either simultaneously or one at a time according to the circumstances, to satisfactorily pack the boxes when necessary or when reversing the direction of the turbii'ie or turbines. In case of too great overpressure or too great underpressure or both at p or 7) there are provided two pipes a and which lead from pipe 0, pipe 6 leading to a low pressure steam chamber and pipef leading to a high pressure steam chamber. Similarly low pressure pipe 6 and high pressurepipe f are connected to pipe 0, By suitable valves in these pipes steam can be led into pipes c or c or steam can be exhausted therefrom, which has the effect of exhausting the steam from the required chambers of the stuffing boxesor allowing steam to enter depending more inth e event of the valves cl and cl becoming out of order the steam in the stufing boxes may be adjusted or equalized by the valves in pipes f,f e and e. To determine 4 the exactpressure in pipes a and o ooin the 'stufiing boxes, pressure gaugestnot shown may be inserted sot-hatan operator may tell at a glancetbe conditionot the-stufling,

boxes and if necessary make adjustments ofthe valves- 1 Figs. 1 and 2 show that'the stuflingbox is divided; along two planes indicated by flangesz l and 2 which represent a vertical plane and a horizontal plane respectively.

The portion of the box enclosed in; the turbine casing isprovided With a flange 1 at right: an les to the axis While theportion outside te turbine-casing-is, in addition tov such aflange, also provided: with a horizontali flange'v2. The spacing rings 4 are adapted to hold each packing ring on the prising a plurality of packing rings in each stufling box forming a plurality of chambers thereinyone chamber-of each box being in communication"withthe atmosphere; a pipe leading tro'm an-inner chamber of one box to an outer chamberot the other box; a second piper leading from an outer chamber of" thefirst-namedstufiing box "to an inner chamber of the secondnamed box; and means forequalizing and regulatingthe pressure in said chambers.

2. A pressure-regulating arrangement for the stufling boxes of steam turbines compris ing a plurality offpacking rings in each A stufiing box forming a plurality of cham- 7 bersthereim one chamber of; each box he I mg 111' communication with; the atmosphere;

,a pipe leading from an inner chamber of one "bor to an outer chamber of the-other box a second pipe lendingnee-1 an outer ham er f; he f r -named st f n to an inner chamber of thesecond-named boXi and means associated with said pipes for equaliz ng and regulat ng the pressure in SfildwCllfilIlbGl'S.

.; t 3. A ,pressuieregulating arrangement, for

the stufiinor boxes of steam turbines comprising a plurality of packing "rings-1n each stuffing bot "forming a plurality of chambers; n therein, one chamber of each box; being in,

leading from an inner chamber of-one box 60 to an outer chamberof thegother box; a

second pipe leading from an outer chambeu of the first-named stufiing box to an inner chamber of the second-named box; and a valve 111 each pipe for equalizmg and regulating the pressure in said chambers.

4. .A pressure-regulating arrangement for the stufiing boxes of'steam turbines comprising a plurality of packing rings in each stuffing box forming a plurality of chambers therein, one chamber of each box being in communicaion with the atmosphere; a

pipe leading froman inner chamber of one box to an outer chamber of the other box; a second pipe leading from an outer chamber of the dlst-named stufling box to aninner chamber of the second-namedbox; a valve in each pipe for equalizing and regulating the pressure in saidi chamber; and additional means associated with sa d pipes for equalizing and regulating the flow into and out of said pipes M, L NDneAARn.

of steam. 

